databaseChangeLog() {
    changeSet(id: "app-20190507-01", author: "chenjingjing") {
        sql(
               "create table country (\n" +
                       "  id          integer  NOT NULL PRIMARY KEY,\n" +
                       "  country_name varchar(32),\n" +
                       "  country_code VARCHAR(2) DEFAULT 'HH',\n" +
                       "  version     INTEGER DEFAULT 1 NOT NULL\n" +
                       ");"
        )
    }
    changeSet(id: "app-20190507-02", author: "chenjingjing") {
        sql(
               "create table user_info (\n" +
                       "  id integer NOT NULL PRIMARY KEY,\n" +
                       "  username varchar(32) NOT NULL,\n" +
                       "  password varchar(32) DEFAULT '12345678',\n" +
                       "  user_type varchar(2),\n" +
                       "  enabled  integer,\n" +
                       "  real_name varchar(50),\n" +
                       "  qq       varchar(12),\n" +
                       "  email    varchar(100),\n" +
                       "  address  varchar(200),\n" +
                       "  tel      varchar(30)\n" +
                       ");"
        )
    }
}